The majority of situations can cause an autistic person to feel a degree of uncertainty.
Even very common situations, such as going on the train or going to a GP appointment, can contain many unpredictable factors, leading to feelings of uncertainty. Neurotypical people don’t tend to worry to the same degree about uncertainty. They might not even feel that situations can have an uncertain outcome. This might be because they naturally have the flexible thinking skills to know what to do should something unexpected happen.